The reception of a CR (carriage return) code causes the display to
start a new line. The system may be inhibited from starting a new line
when the CR code is received. The CTRL F command is used to enable
and disable the start of a new display line when the CR code is received.
Many printers automatically insert a line feed after receiving a
carriage return. By utilizing the CTRL F command, double spacing
can be eliminated on these printers.
4.2 COMMERCIAL RTTY:
Your SWL can be used to copy many commercial RTTY stations
transmitting news bulletins and weather data. While the use of a
general coverage receiver is most useful, you will find some signals just
above the amateur HF bands, in the event you have a HAM-BAND
only receiver.
Most of these transmissions will be at 66 WPM (50 baud) with a
few, especially weather stations, at 100 WPM (75 baud). These speeds
are available to you by means of the ‘CTRL X’.
You may also encounter some stations which are utilizing a non
Latin alphabet, such as Russian, Arabic, etc. You will of course not be
able to decode such transmissions. You should however find numerous
stations using the standard Latin character set with transmissions in
various languages including English.
Commercial stations in general use a wider shift, with 425HZ as
the most typical. Your “NARROW-WIDE” switch should be in the
“WIDE” position.
Note that WEATHER bulletins appear in a fixed format. The start
of a bulletin is indicated by the 4 letter group ZCZC, and its end by the
letter group NNNN. The actual weather information consists mostly of
a number of 5 figure groups, interspaced with plain English and ab
breviations.
When receiving a Weather bulletin, turn off the unshift on space
option in order that you do not shift to letter mode when they send a
word space code. If the “UNSHIFT” is on, you will print letter groups
instead of figures. You can toggle the “UNSHIFT” option on/off by
means of the ‘CTRL U’ command. If you miss a “FIG” code, you can
force the unit to “FIGS” by typing “CTRL Y.” This has the same effect
as if you received the “FIG” code.
4-3
Summary of Contents for SWL
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